The tyres that come on this bike are horrible. The tubes that come with the bike are horrible. The first ride down the block got a flat. Put a slim tube in the front...went for another ride and made it about 2 miles and the rear tyre went flat..so after deciding to upgrade the tyres and tubes. An extra 100 bucks..you would think that after many of the reviews that I read about the tyres that pure fix would fix the issue with the tubes and tyres so that it would be a more trust worthy bike out of the box.